4 - Self-sensing of nano-carbon black concrete

Abstract

Nano-carbon black concrete (CBCC) that has self-sensing ability is attractive for guaranteeing the safety of infrastructure. The self-sensing ability of nanoconcrete is based on the piezoresistivity, which is obtained by adding an appropriate concentration of nano-carbon black into concrete. This chapter presents a comprehensive knowledge of the piezoresistive property of CBCC material, modeling of the piezoresistivity of CBCC, and the performance of a CBCC-based strain sensor embedded in a concrete beam. Specifically, Section 4.2 gives the fabrication and resistance-measuring method of CBCC, and the piezoresistivity of CBCC under monotonic and cycle loading, respectively. Section 4.3 describes the modeling of piezoresistivity of CBCC, which can help us to understand, optimize, and predict the strain-sensing property of CBCC. Section 4.4 is about the application of CBCC-based strain sensors in monitoring the strain state of concrete beam under flexural loading, in which CBCC-based strain sensors are embedded at different strain state zones.